linux-kernel - Re: [PATCH v2] ide/macide: Convert Mac IDE driver to platform driver

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Date:   Mon, 14 Sep 2020 13:42:57 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Finn Thain <fthain@...egraphics.com.au>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Joshua Thompson <funaho@...ai.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-ide@...r.kernel.org
Subject: Re: [PATCH v2] ide/macide: Convert Mac IDE driver to platform driver

Hi Finn,

On Mon, Sep 14, 2020 at 4:47 AM Finn Thain <fthain@...egraphics.com.au> wrote:
> Add platform devices for the Mac IDE controller variants. Convert the
> macide module into a platform driver to support two of those variants.
> For the third, use a generic "pata_platform" driver instead.
> This enables automatic loading of the appropriate module and begins
> the process of replacing the driver with libata alternatives.
>
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Joshua Thompson <funaho@...ai.org>
> References: commit 5ed0794cde593 ("m68k/atari: Convert Falcon IDE drivers to platform drivers")
> References: commit 7ad19a99ad431 ("ide: officially deprecated the legacy IDE driver")
> Tested-by: Stan Johnson <userm57@...oo.com>
> Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
> ---
> This patch was tested successfully on a Powerbook 190 (MAC_IDE_BABOON)
> using both pata_platform and ide_platform drivers.
> The next step will be to try using these generic drivers with the other
> IDE controller variants (MAC_IDE_QUADRA or MAC_IDE_PB) so that the macide
> driver can be entirely replaced with libata drivers.
>
> Changed since v1:
>  - Adopted DEFINE_RES_MEM and DEFINE_RES_IRQ macros.
>  - Dropped IORESOURCE_IRQ_SHAREABLE flag as it is ignored by pata_platform.c
>    and IRQF_SHARED makes no difference in this case.
>  - Removed redundant release_mem_region() call.
>  - Enabled CONFIG_BLK_DEV_PLATFORM in mac_defconfig. We might also enable
>    CONFIG_PATA_PLATFORM but IMO migration to libata should be a separate
>    patch (as this patch has some unrelated benefits).

Thanks for the update!

BTW, who do you envision taking this (or the next version)? IDE or m68k?

> --- a/arch/m68k/configs/mac_defconfig
> +++ b/arch/m68k/configs/mac_defconfig
> @@ -317,6 +317,7 @@ CONFIG_DUMMY_IRQ=m
>  CONFIG_IDE=y
>  CONFIG_IDE_GD_ATAPI=y
>  CONFIG_BLK_DEV_IDECD=y
> +CONFIG_BLK_DEV_PLATFORM=y

I guess we want this in multi_defconfig, too?

>  CONFIG_BLK_DEV_MAC_IDE=y
>  CONFIG_RAID_ATTRS=m
>  CONFIG_SCSI=y

> --- a/drivers/ide/macide.c
> +++ b/drivers/ide/macide.c

> @@ -109,42 +110,61 @@ static const char *mac_ide_name[] =
>   * Probe for a Macintosh IDE interface
>   */
>
> -static int __init macide_init(void)
> +static int mac_ide_probe(struct platform_device *pdev)
>  {

>         printk(KERN_INFO "ide: Macintosh %s IDE controller\n",
>                          mac_ide_name[macintosh_config->ide_type - 1]);
>
> -       macide_setup_ports(&hw, base, irq);
> +       macide_setup_ports(&hw, mem->start, irq->start);
>
> -       return ide_host_add(&d, hws, 1, NULL);
> +       rc = ide_host_add(&d, hws, 1, &host);
> +       if (rc)
> +               return rc;
> +
> +       platform_set_drvdata(pdev, host);

Move one up, to play it safe?

> +       return 0;
>  }
>
> -module_init(macide_init);
> +static int mac_ide_remove(struct platform_device *pdev)
> +{
> +       struct ide_host *host = dev_get_drvdata(&pdev->dev);

As you use platform_set_drvdata() above, you might as well use the
platform_get_drvdata() helper here, for symmetry.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds